Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e7b2355ea6b541…

MALICIOUS

PDF

41.9 KB Created: 2020-08-19 10:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93ce75d16686b58e88f03316a02603bd SHA-1: 0277a4617d6163f214e35ef6058915c2e2ac0012 SHA-256: 72e7b2355ea6b5410bc303a5df3e41ca492585501bb75d4753e8d6ade7391fc3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document is classified as malicious by an ML model and contains numerous embedded links, including a redirector to a known malicious domain. The document body, though partially garbled, suggests a lure related to a "Cpf1 guide rna design tool", likely intended to trick users into clicking the malicious links. The presence of a link farm and a redirector indicates an attempt to lead users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=cpf1+guide+rna+design+tool
    • http://remuz.newneighborscc.com/uploads/1/3/0/8/130873952/wolixuwowajineluk.pdf
    • http://files.youthattentioncenter.com/uploads/1/3/1/1/131164520/rinanib.pdf
    • http://navomum.mtzionucc.org/uploads/1/3/1/6/131606731/tasagut.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7142/2102/files/binirirobarum.pdf
    • https://cdn.shopify.com/s/files/1/0445/1749/0847/files/58303324162.pdf
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/canvas_exemplo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fofigez.pdf
    • https://cdn.shopify.com/s/files/1/0435/9503/8877/files/jogadovu.pdf
    • https://cdn.shopify.com/s/files/1/0435/6915/2159/files/vabarim.pdf
    • https://cdn.shopify.com/s/files/1/0432/3993/2067/files/apotheosis_novel_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/2045/1997/files/relidevapejo.pdf
    • https://cdn.shopify.com/s/files/1/0432/1430/7496/files/rexuwazenafomuvebo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066d4.bin
8bb107d2be2482bb76baf4d0c06fa2110f88c43dcf545c5364668a1fc1a68bab
pdf-font-stream PDF embedded font (sfnt) at offset 0x66D4 5168 bytes
font_01_sfnt_off00007880.bin
3b8efa6f7c6f341e7b77ce38f7ab7d266b783288095e4300705f2b39c011091e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7880 10120 bytes